Motor and equipment
By designing air-floating bearings and gas supply components with different bearing surface areas in the motor, the problem that air-floating bearings are easily crushed when the axial force is too large is solved, and effective protection of the thrust disk is achieved.
Patent Information
- Application Number
- CN202421503830.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-27
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2034-06-27
AI Technical Summary
When the axial force of the existing air-floating bearing motor is too large, the air-floating bearing is easily crushed.
A motor is designed in which the first bearing surface area of the gas floating bearing is smaller than the second bearing surface area, the outer diameter of the thrust disk is greater than or equal to the outer diameter of the gas floating bearing, and gas is supplied to the gaps on both sides through the gas supply module, so that when the gas pressure remains unchanged, the external force of the gas on the thrust disk on the first clearance is reduced, the external force of the gas in the second clearance is increased, and the external force of the gas in the second clearance is formed to cancel the axial force.
It effectively avoids the thrust disc crushing the air-floating bearing due to excessive axial force, extending the service life of the air-floating bearing.
Smart Images
Figure CN222884446U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of drive devices, and in particular, to a motor and a device. Background Art
[0002] The motor adopts air bearing, and high-pressure gas is filled between the air bearing and the thrust plate, so that an air film is formed between the thrust plate and the air bearing. This makes the thrust plate encounter lower resistance when rotating, thereby reducing the mechanical contact between the thrust plate and the bearing, thereby reducing wear and improving rotation accuracy and life.
[0003] In existing air bearing motors, the same air bearings are usually used at both ends of the thrust plate, and the area of the air film formed by the two air bearings between the thrust plates is almost the same. When the axial force of the motor is too large, the two air films exert thrusts on the thrust plate in opposite directions, and the difference in the magnitude of the two thrusts is small, resulting in a large resultant external force on the thrust plate, which may eventually cause the thrust plate to crush the air bearing. Utility Model Content
[0004] The main purpose of the present application is to provide a motor to at least solve the problem in the prior art that the air bearing is crushed when the axial force of the motor is too large.
[0005] According to one aspect of the present application, there is provided a motor, comprising:
[0006] Machine base;
[0007] A rotating shaft, the rotating shaft is rotatably disposed in the base, and the rotating shaft has a driving end extending out of the base, and the driving end is used to connect with a driven member;
[0008] A thrust plate, wherein the thrust plate is fixedly sleeved on a side of the rotating shaft close to the driving end;
[0009] An air bearing, wherein the air bearings include two air bearings, both of which are sleeved on the outer circumference of the rotating shaft and are respectively located on both sides of the thrust plate, wherein a first gap is provided between the air bearing far from the driving end and the thrust plate, and the air bearing far from the driving end has a first bearing surface opposite to the thrust plate, wherein a second gap is provided between the air bearing close to the driving end and the thrust plate, and the air bearing close to the driving end has a second bearing surface opposite to the thrust plate, the area of the first bearing surface is smaller than the area of the second bearing surface, the outer diameter of the thrust plate is greater than or equal to the outer diameter of the air bearing, and the center line through the center of the first bearing surface and the center line through the center of the second bearing surface are both on the axis of the rotating shaft;
[0010] An air supply component is communicated with the first gap and the second gap respectively, and is used to supply air to the first gap and the second gap.
[0011] Furthermore, the air bearing includes a first air bearing and a second air bearing, the first air bearing and the thrust plate have the first gap, the second air bearing and the thrust plate have the second gap, the inner diameter of the first air bearing is the same as the inner diameter of the second air bearing, and the outer diameter of the first air bearing is smaller than the outer diameter of the second air bearing.
[0012] Furthermore, the thrust plate includes a main body and a first annular boss, the first annular boss is arranged on a side of the main body close to the first air bearing, the first annular boss is arranged around the outer periphery of the rotating shaft, and the first annular boss protrudes in a direction close to the first air bearing, the first air bearing is sleeved on the first annular boss and has the first gap between it and the main body.
[0013] Furthermore, the thrust plate also includes a second annular boss, which is arranged on a side of the main body close to the first air bearing, the second annular boss is coaxially arranged with the first annular boss, and the second annular boss is arranged around the outer periphery of the first annular boss, the second annular boss protrudes in a direction close to the first air bearing, and the protruding height of the second annular boss is lower than the protruding height of the first annular boss, and the first gap is located between the second annular boss and the first air bearing.
[0014] Furthermore, the motor further comprises a fixing member, and the air bearing is connected to the base via the fixing member;
[0015] An avoidance recessed space is provided between the main body and the second annular boss, and the avoidance recessed space is used for avoiding the fixing member.
[0016] Furthermore, the thrust plate also includes a third annular boss, which is arranged on a side of the main body close to the second air bearing, the third annular boss is coaxially arranged with the first annular boss, the third annular boss protrudes in a direction close to the second air bearing, the second air bearing is sleeved on the third annular boss, and has the second gap between the third annular boss and the main body.
[0017] Furthermore, the base includes an end cover, which is arranged on a first side of the base close to the thrust plate, and a first mounting groove is formed on a side of the end cover close to the thrust plate, and the first air bearing is mounted in the first mounting groove.
[0018] Furthermore, the machine base also includes a sealing plate, which is arranged on the second side of the machine base close to the thrust plate, and the sealing plate is connected to the end cover. A second mounting groove is opened on the side of the sealing plate close to the thrust plate, and the second air bearing is installed in the second mounting groove.
[0019] Furthermore, the air bearing far away from the driving end is provided with a first air inlet hole, a first end of the first air inlet hole is connected to the air supply assembly, and a second end of the first air inlet hole is communicated with the first gap;
[0020] A second air inlet hole is formed in the air bearing near the driving end, a first end of the second air inlet hole is connected to the air supply assembly, and a second end of the second air inlet hole is communicated with the second gap.
[0021] On the other hand, the present application provides a device, which includes the above-mentioned motor.
[0022] Compared with the prior art, the area of the first bearing surface in the present application is smaller than the area of the second bearing surface, the outer diameter of the thrust plate is larger than the outer diameter of the air bearing near the drive end, and the center line through the center of the first bearing surface and the center line through the center of the second bearing surface are both on the axis of the rotating shaft. This means that the first bearing surface, the second bearing surface and the rotating shaft are coaxially arranged, and the area of the first gap between the first bearing surface and the thrust plate is smaller than the area of the second gap between the second bearing surface and the thrust plate. When the gas pressure remains unchanged, there is a large gap between the external force applied by the gas in the first gap to the thrust plate and the external force applied by the gas in the second gap to the thrust plate. Therefore, the combined external force of the thrust applied by the gas to the thrust plate is large, and the direction is opposite to the direction of the axial force of the motor, thereby offsetting the influence of the axial force on the thrust plate to a certain extent, thereby avoiding the axial force on the thrust plate being too large to damage the air bearing. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:
[0024] Figure 1 A schematic diagram of the structure of the motor disclosed in this application;
[0025] Figure 2 for Figure 1 Enlarged view of the middle I area;
[0026] Figure 3 It is a structural schematic diagram of the thrust plate disclosed in the present application in a first viewing angle;
[0027] Figure 4It is a structural schematic diagram of the thrust plate disclosed in the present application at a second viewing angle;
[0028] Figure 5 It is a cross-sectional view of the thrust plate disclosed in the present application.
[0029] The above drawings include the following reference numerals:
[0030] 10. Base; 11. End cover; 12. Sealing plate; 20. Rotating shaft; 21. Driving end; 30. Driven part; 40. Air bearing; 41. First air bearing; 42. Second air bearing; 50. Thrust plate; 51. Main body; 52. First annular boss; 53. Second annular boss; 54. Avoiding recessed space; 55. Third annular boss; 60. Fixing member; 71. First gap; 72. Second gap; 101. Mounting cavity; 110. First mounting groove; 120. Second mounting groove; 410. First bearing surface; 420. Second bearing surface. DETAILED DESCRIPTION
[0031] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0032] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.
[0033] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.
[0034] See also Figure 1 to Figure 2As shown, according to an embodiment of the present application, a motor is provided, including a base 10, a rotating shaft 20, a thrust plate 50, an air bearing 40 and an air supply assembly (not shown in the figure).
[0035] The rotating shaft 20 is rotatably disposed in the base 10 and has a driving end 21 extending from the base 10, and the driving end 21 is used to connect with the driven member 30. The thrust plate 50 is fixedly sleeved on one side of the rotating shaft 20 close to the driving end 21. The air bearings 40 include two, both of which are sleeved on the outer periphery of the rotating shaft 20 and are respectively located on both sides of the thrust plate 50, wherein a first gap 71 is provided between the air bearing 40 far from the driving end 21 and the thrust plate 50, and the air bearing 40 far from the driving end 21 has a first bearing surface 410 opposite to the thrust plate 50, wherein a second gap 72 is provided between the air bearing 40 near the driving end 21 and the thrust plate 50, and the air bearing 40 near the driving end 21 has a second bearing surface 420 opposite to the thrust plate 50, the area of the first bearing surface 410 is smaller than the area of the second bearing surface 420, the outer diameter of the thrust plate 50 is greater than or equal to the outer diameter of the air bearing 40, and the center line passing through the center of the first bearing surface 410 and the center line passing through the center of the second bearing surface 420 are both on the axis of the rotating shaft 20. The air supply assembly is respectively connected to the first gap 71 and the second gap 72, and is used to supply air to the first gap 71 and the second gap 72.
[0036] Specifically, when the motor is started, the shaft 20 rotates at a high speed, causing the motor to generate a rotational force to the left along the axis direction (as shown in the attached figure). Figure 1 The axial force (in the X1 direction) of the thrust plate 50 will cause the thrust plate 50 to have a tendency to move along the air bearing 40 close to the drive end 21. Since the air supply assembly supplies air to the first gap 71 and the second gap 72 respectively, the first gap 71 and the second gap 72 are filled with high-pressure gas. When the thrust plate 50 moves along the air bearing 40 close to the drive end 21, the width of the first gap 71 decreases, so that the air pressure in the first gap 71 is compressed, resulting in the thrust exerted on the thrust plate 50 by the air pressure in the first gap 71 being slightly higher than the thrust exerted on the thrust plate 50 by the gas in the second gap 72. Therefore, the thrust plate 50 will be subjected to an external force in the opposite direction to the axial force of the motor (such as the attached Figure 1In the X2 direction), the thrust is small, so as to reduce the effect of the axial force on the thrust disk 50. In addition, when the gas flows out from the edge of the first gap 71 corresponding to the first bearing surface 410, the pressure of the gas is reduced, and it is impossible to apply pressure to the thrust disk 50, or the thrust applied is almost zero. Similarly, when the gas flows out from the edge of the second gap 72 corresponding to the second bearing surface 420, the pressure of the gas is reduced, and it is impossible to apply thrust to the thrust disk 50, or the thrust applied is almost zero, that is, only the gas in the first gap 71 corresponding to the first bearing surface 410 and the gas in the second gap 72 corresponding to the second bearing surface 420 will apply a large thrust to the thrust disk 50.
[0037] Compared with the prior art, in this embodiment, the area of the first bearing surface 410 is smaller than the area of the second bearing surface 420, the outer diameter of the thrust plate 50 is larger than the outer diameter of the air bearing 40 close to the driving end 21, and the center line passing through the center of the first bearing surface 410 and the center line passing through the center of the second bearing surface 420 are both on the axis of the rotating shaft 20. This means that the first bearing surface 410, the second bearing surface 420 and the rotating shaft 20 are coaxially arranged, and the area of the first gap 71 between the first bearing surface 410 and the thrust disc 50 is smaller than the area of the second gap 72 between the second bearing surface 420 and the thrust disc 50. When the gas pressure remains unchanged, there is a large difference between the external force applied by the gas in the first gap 71 to the thrust disc 50 and the external force applied by the gas in the second gap 72 to the thrust disc 50. Therefore, the resultant external force of the thrust applied by the gas to the thrust disc 50 is large, and the direction is opposite to the axial force of the motor, thereby offsetting the influence of the axial force on the thrust disc 50 to a certain extent, thereby preventing the axial force on the thrust disc 50 from being too large and crushing the air bearing 40. In addition, in a preferred embodiment, the resultant force of the external force applied by the gas in the first gap 71 to the thrust disc 50 and the external force applied by the gas in the second gap 72 to the thrust disc 50 is equal to the axial force of the motor, thereby preventing the thrust disc 50 from pressing against the air bearing 40. In this embodiment, the driven member 30 can be an impeller.
[0038] Furthermore, the air bearing 40 includes a first air bearing 41 and a second air bearing 42. There is a first gap 71 between the first air bearing 41 and the thrust plate 50, and there is a second gap 72 between the second air bearing 42 and the thrust plate 50. The inner diameter of the first air bearing 41 is the same as the inner diameter of the second air bearing 42, and the outer diameter of the first air bearing 41 is smaller than the outer diameter of the second air bearing 42.
[0039] Specifically, the air bearing 40 far from the driving end 21 is the first air bearing 41, and the air bearing 40 close to the driving end 21 is the second air bearing 42. In order to make the area of the first bearing surface 410 on the first air bearing 41 smaller than the area of the second bearing surface 420 on the second air bearing 42, thereby reducing the area of the first gap 71 between the first bearing surface 410 and the thrust plate 50 and increasing the area of the second gap 72 between the second bearing surface 420 and the thrust plate 50, in this embodiment, the inner diameter of the first air bearing 41 is the same as the inner diameter of the second air bearing 42, and the outer diameter of the first air bearing 41 is smaller than the outer diameter of the second air bearing 42, so that the thrust force of the gas on the thrust plate 50 is larger and the direction is opposite to the axial force of the motor.
[0040] Optionally, in some embodiments, the inner diameter of the first air bearing 41 is larger than the outer diameter of the second air bearing 42, and the outer diameter of the first air bearing 41 is smaller than the outer diameter of the second air bearing 42.
[0041] As attached Figure 3 To Attachment Figure 5 As shown, the thrust plate 50 includes a main body 51 and a first annular boss 52. The first annular boss 52 is arranged on a side of the main body 51 close to the first air bearing 41. The first annular boss 52 is arranged around the outer periphery of the rotating shaft 20, and the first annular boss 52 protrudes in a direction close to the first air bearing 41. The first air bearing 41 is sleeved on the first annular boss 52 and has a first gap 71 between the main body 51.
[0042] Specifically, the first annular boss 52 of the thrust plate 50 enables the first air bearing 41 to exert a certain limiting effect on the thrust plate 50 when the thrust plate 50 shakes. In addition, the first air bearing 41 is sleeved on the first annular boss 52 so that the first bearing surface 410 on the first air bearing 41 is directly opposite to the main body 51 of the thrust plate 50, thereby avoiding the first bearing surface 410 and the thrust plate 50 from being misaligned in the radial direction, resulting in an excessively small air film area between the air bearing 40 and the thrust plate 50.
[0043] In addition, the thrust plate 50 also includes a second annular boss 53, which is arranged on a side of the main body 51 close to the first air bearing 41, the second annular boss 53 is coaxially arranged with the first annular boss 52, and the second annular boss 53 is arranged around the outer periphery of the first annular boss 52, the second annular boss 53 protrudes in a direction close to the first air bearing 41, and the protruding height of the second annular boss 53 is lower than the protruding height of the first annular boss 52, and the first gap 71 is located between the second annular boss 53 and the first air bearing 41.
[0044] Specifically, the force-bearing surface on the thrust plate 50 that is opposite to the first bearing surface 410 on the first air bearing 41 is the surface of the second annular boss 53, that is, the surface on which the gas in the first gap 71 applies thrust to the thrust plate 50 is mainly the surface of the second annular boss 53. In addition, the second annular boss 53 protrudes in the direction close to the first air bearing 41 to reduce the width of the first gap 71, thereby increasing the pressure of the gas in the first gap 71. At the same time, the protruding height of the second annular boss 53 is lower than the protruding height of the first annular boss 52 to prevent the protruding height of the second annular boss 53 from being too high, causing the thrust plate 50 to abut against the first air bearing 41.
[0045] As attached Figure 2 As shown, the motor further comprises a fixing member 60, and the air bearing 40 is connected to the base 10 via the fixing member 60. An escape recess space 54 is provided between the main body 51 and the second annular boss 53, and the escape recess space 54 is used to escape the fixing member 60.
[0046] In this embodiment, since the first air bearing 41 is relatively small in size and the second air bearing 42 is relatively large in size, when the first air bearing 41 is fixed to the machine base 10 using the fixing member 60, interference may occur between the fixing member 60 and the thrust plate 50. Therefore, in this embodiment, an avoidance recessed space 54 is provided between the main body 51 and the second annular boss 53 to avoid the fixing member 60 and prevent the fixing member 60 from interfering with the thrust plate 50. In this embodiment, the side wall surface of the avoidance recessed space 54 close to the second annular boss 53 is provided as an arc-shaped transition surface, so as to avoid, to a certain extent, the side wall surface of the avoidance recessed space 54 close to the second annular boss 53 from colliding with the fixing member 60 after the thrust plate 50 shakes.
[0047] Furthermore, the thrust plate 50 also includes a third annular boss 55, which is arranged on a side of the main body 51 close to the second air bearing 42. The third annular boss 55 is coaxially arranged with the first annular boss 52. The third annular boss 55 protrudes in a direction close to the second air bearing 42. The second air bearing 42 is sleeved on the third annular boss 55 and has a second gap 72 with the main body 51.
[0048] Similarly, the third annular boss 55 is provided so that when the thrust plate 50 shakes, the second air bearing 42 can exert a certain limiting effect on the thrust plate 50. In this embodiment, the third annular boss 55 has the same protrusion height as the first annular boss 52, and the second bearing surface 420 on the second air bearing 42 is directly opposite to the surface of the main body 51, so that the gas in the second gap 72 can exert thrust on the surface of the main body 51.
[0049] Furthermore, the base 10 includes an end cover 11 , which is disposed on a first side of the base 10 close to the thrust plate 50 , and a first mounting groove 110 is formed on the side of the end cover 11 close to the thrust plate 50 , in which the first air bearing 41 is mounted.
[0050] In addition, the machine base 10 also includes a sealing plate 12, which is arranged on the second side of the machine base 10 close to the thrust plate 50, and the sealing plate 12 is connected to the end cover 11. A second mounting groove 120 is opened on the side of the sealing plate 12 close to the thrust plate 50, and the second air bearing 42 is installed in the second mounting groove 120.
[0051] Specifically, the end cover 11 and the sealing plate 12 are arranged to form an installation cavity 101, and the thrust plate 50, the first air bearing 41 and the second air bearing 42 are all arranged in the installation cavity 101. In order to avoid the first air bearing 41 or the second air bearing 42 from abutting against the thrust plate 50, a first installation groove 110 is opened on the side of the end cover 11 close to the thrust plate 50 in this embodiment, and the first air bearing 41 is installed in the first installation groove 110 through a fixing member 60. A second installation groove 120 is provided on the side of the sealing plate 12 close to the thrust plate 50, and the second air bearing 42 is installed in the second installation groove 120 through a fixing member 60, thereby preventing the installation cavity 101 from being too small, which causes the first air bearing 41 or the second air bearing 42 to abut against the thrust plate 50.
[0052] Furthermore, the air bearing 40 away from the driving end 21 is provided with a first air inlet hole (not shown in the figure), the first end of the first air inlet hole is connected to the air supply component, and the second end of the first air inlet hole is communicated with the first gap 71; the air bearing 40 close to the driving end 21 is provided with a second air inlet hole (not shown in the figure), the first end of the second air inlet hole is connected to the air supply component, and the second end of the second air inlet hole is communicated with the second gap 72.
[0053] Specifically, the air supply assembly allows high-pressure gas to enter the first gap 71 through the first air inlet hole, so that a high-pressure gas film is formed in the first gap 71. At the same time, the air supply assembly also allows high-pressure gas to enter the second gap 72 through the second air inlet hole, so that a high-pressure gas film is formed in the second gap 72. The high-pressure gas film can reduce the friction generated when the thrust plate 50 rotates. In this embodiment, the outlet of the first air inlet hole is opened on the first bearing surface 410, and the outlet of the second air inlet hole is opened on the second bearing surface 420.
[0054] On the other hand, the present application also provides a device, which includes the motor in the above embodiment, so the device includes all the technical effects of the motor in the above embodiment. Since the technical effects of the motor have been described in detail above, they will not be repeated here.
[0055] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.
[0056] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.
[0057] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A motor, characterized in that: include: A machine base (10); A rotating shaft (20), the rotating shaft (20) being rotatably disposed in the machine base (10), and the rotating shaft (20) having a driving end (21) extending out of the machine base (10), the driving end (21) being used to connect with a driven member (30); A thrust plate (50), wherein the thrust plate (50) is fixedly sleeved on a side of the rotating shaft (20) close to the driving end (21); An air bearing (40), wherein the air bearing (40) includes two air bearings (40), both of which are sleeved on the outer periphery of the rotating shaft (20) and are respectively located on both sides of the thrust plate (50), wherein a first gap (71) is provided between the air bearing (40) away from the driving end (21) and the thrust plate (50), and the air bearing (40) away from the driving end (21) has a first bearing surface (410) opposite to the thrust plate (50), wherein the air bearing (40) close to the driving end (21) is in contact with the thrust plate (50), and the air bearing (40) close to the driving end (21) is in contact with the thrust plate (50). The thrust disks (50) have a second gap (72) therebetween, the air bearing (40) close to the driving end (21) has a second bearing surface (420) opposite to the thrust disk (50), the area of the first bearing surface (410) is smaller than the area of the second bearing surface (420), the outer diameter of the thrust disk (50) is greater than or equal to the outer diameter of the air bearing (40), and the center line passing through the center of the first bearing surface (410) and the center line passing through the center of the second bearing surface (420) are both on the axis of the rotating shaft (20); An air supply component is communicated with the first gap (71) and the second gap (72) respectively, and is used to supply air to the first gap (71) and the second gap (72).
2. The motor according to claim 1, characterized in that The air bearing (40) comprises a first air bearing (41) and a second air bearing (42), wherein the first air bearing (41) and the thrust plate (50) have a first gap (71), and the second air bearing (42) and the thrust plate (50) have a second gap (72), the inner diameter of the first air bearing (41) is the same as the inner diameter of the second air bearing (42), and the outer diameter of the first air bearing (41) is smaller than the outer diameter of the second air bearing (42).
3. The motor according to claim 2, characterized in that The thrust plate (50) comprises a main body (51) and a first annular boss (52), wherein the first annular boss (52) is arranged on a side of the main body (51) close to the first air bearing (41), the first annular boss (52) is arranged around the outer periphery of the rotating shaft (20), and the first annular boss (52) protrudes in a direction close to the first air bearing (41), the first air bearing (41) is sleeved on the first annular boss (52), and has the first gap (71) between the first annular boss (52) and the main body (51).
4. The motor according to claim 3, characterized in that The thrust plate (50) further comprises a second annular boss (53), the second annular boss (53) being arranged on a side of the main body (51) close to the first air bearing (41), the second annular boss (53) being coaxially arranged with the first annular boss (52), and the second annular boss (53) being arranged around the outer periphery of the first annular boss (52), the second annular boss (53) being raised in a direction close to the first air bearing (41), and the raised height of the second annular boss (53) being lower than the raised height of the first annular boss (52), and the first gap (71) being located between the second annular boss (53) and the first air bearing (41).
5. The motor according to claim 4, characterized in that The motor further comprises a fixing member (60), and the air bearing (40) is connected to the machine base (10) via the fixing member (60); An avoidance recessed space (54) is provided between the main body (51) and the second annular boss (53), and the avoidance recessed space (54) is used to avoid the fixing member (60).
6. The motor according to claim 3, characterized in that The thrust plate (50) further comprises a third annular boss (55), wherein the third annular boss (55) is arranged on a side of the main body (51) close to the second air bearing (42), the third annular boss (55) is coaxially arranged with the first annular boss (52), the third annular boss (55) protrudes in a direction close to the second air bearing (42), the second air bearing (42) is sleeved on the third annular boss (55), and has the second gap (72) between the third annular boss (55) and the main body (51).
7. The electric machine according to any one of claims 2 to 6, characterized in that The machine base (10) comprises an end cover (11), wherein the end cover (11) is arranged on a first side of the machine base (10) close to the thrust plate (50), and a first mounting groove (110) is provided on a side of the end cover (11) close to the thrust plate (50), and the first air bearing (41) is mounted in the first mounting groove (110).
8. The motor according to claim 7, characterized in that The machine base (10) further comprises a sealing plate (12), wherein the sealing plate (12) is arranged on a second side of the machine base (10) close to the thrust plate (50), and the sealing plate (12) is connected to the end cover (11), and a second mounting groove (120) is provided on a side of the sealing plate (12) close to the thrust plate (50), and the second air bearing (42) is mounted in the second mounting groove (120).
9. The electric machine according to any one of claims 1 to 6, characterized in that The air bearing (40) far away from the driving end (21) is provided with a first air inlet hole, a first end of the first air inlet hole is connected to the air supply component, and a second end of the first air inlet hole is communicated with the first gap (71); The air bearing (40) close to the driving end (21) is provided with a second air inlet hole, a first end of the second air inlet hole is connected to the air supply assembly, and a second end of the second air inlet hole is communicated with the second gap (72).
10. A device, characterized in that: The device comprises an electric machine as claimed in any one of claims 1 to 9.